Tom said: "I installed a new set of plugs and wires"
That would have been my first plan too. But it didn't fix it...
Several good theories here, John T is correct with the voltage increase being able to fire a simi-fouled plug, but the plugs are new...
Take a look at the plug that is misfiring:
Possibly the new plug is defective, switch it with another plug, see if the problem follows.
Take a look at the plug, is it gaped properly?
Is it already fouled? Bridged with a piece of carbon? Oil splashed? Coolant? Possibly there is a problem with the cylinder (hopefully not, this is just an idea). If that cylinder was run dead for a while, it may have carboned and oiled up the combustion chamber. Once it started hitting again the carbon and oil were splashed on to the new plug. If the head gasket is leaking the plug may be getting water on it, grounding it out. If it is already oil fouled, try installing a non-fouler on that cylinder temporarly to get it cleaned up. Then maybe it will be ok once it's dried up, but there is a posibility there is a compression/oil control problem.
Still a possibility the cap is cracked, leaking voltage to ground or between terminals.
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